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Summary: Diagnostic tool to locate highly distorted elements.
A = 1: (On) = Nodal aspect ratio is plotted instead of stream function
A = 0: (Off) = Stream Function is plotted
Nodal aspect ratio is a useful diagnostic tool for identifying regions that have highly distorted elements. A value of nodal aspect ration greater than 2000 is a good indication that there is either a problem with the geometry or that the mesh needs to be refined.
High ratio elements are typically found at tangent points or in small spaces between solid parts. Eliminate or enlarge these spaces in the CAD model for best results.
Note that often these geometric features are highlighted by Diagnostics. Use the information provided by Diagnostics to identify problematic features.
For more about Mesh Diagnostics...